WO2020071215A1 - Molding method - Google Patents
Molding methodInfo
- Publication number
- WO2020071215A1 WO2020071215A1 PCT/JP2019/037736 JP2019037736W WO2020071215A1 WO 2020071215 A1 WO2020071215 A1 WO 2020071215A1 JP 2019037736 W JP2019037736 W JP 2019037736W WO 2020071215 A1 WO2020071215 A1 WO 2020071215A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- mold
- sheet
- resin
- divided
- molding
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C49/04—Extrusion blow-moulding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/48—Moulds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/02—Combined thermoforming and manufacture of the preform
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/10—Forming by pressure difference, e.g. vacuum
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/30—Moulds
Definitions
- the present invention relates to a molding method for vacuum molding a resin sheet, and more particularly to a molding method capable of efficiently molding a molded article.
- Patent Document 1 discloses a vacuum forming method of a sheet in which a heat-softened forming sheet is brought into suction contact with a forming die having irregularities on a forming surface by a vacuum suction means to form the sheet. There has been proposed a technique for preventing the thickness from becoming thin and preventing the thickness from being reduced.
- the extruded molten resin sheet is drooped downward as it is, and the vertically extending resin sheet is clamped to form a vacuum so that the resin is extruded in the secondary direction, as compared with the case where the resin is extruded in the lateral direction. It is possible to feed the resin sheet out of the extrusion die in a non-contact state without having to support the molten resin sheet until the mold is closed.
- the present invention has been proposed in view of the above-mentioned conventional circumstances, and has as its object to provide a molding method capable of significantly improving molding efficiency.
- a molding method is a method in which a molten first sheet-like resin and a second sheet-like resin extruded from an extruder are directly dropped downward and divided.
- the first sheet-shaped resin is placed between the molds, and the air between the one divided mold and the first sheet-shaped resin is depressurized to bring the first sheet-shaped resin into close contact with the mold cavity of one of the divided molds, while the other divided
- the second sheet-shaped resin is brought into close contact with the mold cavity of the other divided mold by reducing the pressure of the air between the mold and the second sheet-shaped resin. It is characterized in that the mold is interposed and the mold is clamped.
- the second invention of the present application has been devised to solve such inconvenience. That is, in the molding method of the second invention of the present application, the molten sheet-like resin extruded from the extruder is suspended downward, and disposed between the molding die and the closed space forming die. When the sheet-shaped resin is brought into close contact with the mold cavity of the molding die by reducing the pressure between the mold and the sheet-shaped resin, a plurality of surfaces are formed on the surface of the closed space forming mold facing the molding die. The fins are arranged substantially in parallel, and in each area divided by the fins, cooling by air is performed from the closed space forming mold side.
- the configuration of the second invention of the present application can be combined with the configuration of the first invention of the present application.
- This is the third invention of the present application. That is, in the molding method of the third invention of the present application, the first sheet resin and the second sheet resin in a molten state extruded from an extruder are drooped downward as they are and arranged between the split molds, The first sheet-shaped resin is brought into close contact with the mold cavity of one of the divided molds by reducing the pressure of the air between one divided mold and the first sheet-shaped resin, and the other divided mold and the second sheet-shaped resin.
- the second sheet-shaped resin is brought into close contact with the mold cavity of the other divided mold by reducing the pressure of the air between the resins, and the facing surface of each divided mold with each sheet-shaped resin facing each divided mold.
- an intermediate mold having a plurality of fins arranged substantially in parallel is interposed therebetween, and after clamping, the mold is cooled by air from the intermediate mold side.
- fins for rectification are provided to perform cooling by the refrigerant (air), so that the refrigerant flows into the space regulated by the fins.
- the first invention of the present application it is possible to provide a molding method capable of significantly improving molding efficiency as compared with a method of molding a sheet-like resin one by one. Further, according to the present invention, burr treatment is easy, and in this regard, molding efficiency can be improved.
- the second aspect of the present invention it is possible to suppress the occurrence of deformation due to non-uniform cooling, and to realize highly accurate vacuum forming.
- FIG. 4 is a schematic front view showing a surface of the mold for forming a closed space facing a molding die.
- FIG. 2 is a schematic cross-sectional view showing a cross section of a molding die and a closed space forming die in a mold closed state.
- FIG. 3 shows an example of a forming method for forming an inner rib.
- 9 shows another example of a molding method for forming an inner rib.
- the molding apparatus used in the molding of the present embodiment.
- the molding apparatus includes two extruders 1 from which the sheet-shaped resin droops from each of the extruders 1. It is extruded in the form.
- Each extruder 1 is a conventionally known type, and detailed description thereof is omitted, but a cylinder 12 provided with a hopper 11, a screw (not shown) provided in the cylinder 12, and a screw connected to the screw.
- the molten resin is melted and kneaded by the rotation of the screw, and the molten resin is transferred to the accumulator 14 and stored in a certain amount.
- the molten resin is sent toward the T-die 16 by driving the plunger 15, and the continuous Resin is extruded, and a pair of rollers 18 are arranged at intervals. While being pressed is fed downward.
- each of the split molds 21 and 22 has a plurality of vacuum suction holes 21B and 22B facing the inner surfaces (molding surfaces) of the mold cavities 21A and 22A.
- molds 31 and 32 are provided so as to be able to advance and retreat.
- the vacuum suction holes 31A and 32A are also provided in the mold frames 31 and 32, respectively, facing the surfaces in contact with the sheet-like resin.
- the intermediate mold 23 has one abutment surface 23A in contact with the split mold 21 and the other abutment surface 23B in contact with the split mold 22.
- Each abutment surface 23A, 23b has
- the split molds 21 and 22 have protrusions 23C and 23D which are abutted along the outer periphery of the mold cavities 21A and 22A.
- the projecting portions 23C and 23D of the intermediate mold 23 abut against the outside of the mold cavities 21A and 22A of the split molds 21 and 22, and the sheet-like resin is sandwiched, so that the outer peripheral portion of the formed sheet-like resin is reduced. It becomes a cut-out shape, and it becomes easy to remove burrs on the outside of the molded product.
- the intermediate mold 23 has an annular structure corresponding to the outer peripheral shape thereof according to the shapes of the mold cavities 21A and 22A of the split molds 21 and 22. That is, the intermediate mold 23 has a shape in which the center portion is hollowed out.
- the above-described molding apparatus is based on vacuum molding, and therefore, the intermediate mold 23 does not require a special mechanism such as an air blowing mechanism.
- the sheet resins S1 and S2 are continuously extruded from the extrusion slit 17 of each extruder 1.
- the extrusion speed and the feeding speed at which the sheet resins S1 and S2 are fed downward by the pair of rollers 18 according to the extrusion speed of the respective sheet resins S1 and S2. Is adjusted by adjusting the rotation speed of the pair of rollers 18, and when the sheet-like resins S ⁇ b> 1 and S ⁇ b> 2 pass between the pair of rollers 18, the sheet-like resins S ⁇ b> 1 and S ⁇ b> 2 are pulled downward by the pair of rollers 18.
- the sheet-like resins S1 and S2 are stretched and thinned, and as a result, drawdown or neck-in is effectively prevented.
- the adjustment of the interval between the extrusion slits 17 may be performed in conjunction with the adjustment of the rotation speed of the pair of rollers 18.
- thermoplastic material used for the sheet-like resins S1 and S2 is arbitrary.
- a foamed resin or the like can be used.
- the molds 31 and 32 of the split molds 21 and 22 are advanced (that is, moved toward the sheet-like resins S1 and S2), and each of the sheet-like resins S1 and S2 is moved. Make contact with the main surface.
- vacuum suction is performed by the vacuum suction holes 31A and 32A provided in the molds 31 and 32, and the sheet-shaped resins S1 and S2 are adsorbed to the molds 31 and 32.
- a sealed space is formed by the respective sheet-shaped resins S1, S2, the corresponding molds 31, 32, and the mold cavities 21A, 22A.
- the molds 31 and 32 are retracted to their original positions in a state where the sheet-shaped resins S1 and S2 are sucked, and the sheet-shaped resins S1 and S2 are brought into contact with the split molds 21 and 22. After that, suction from the mold vacuum suction holes 21B and 22B provided in the mold cavities 21A and 22A of the split molds 21 and 22 is started.
- the air in the sealed spaces (mold cavities 21A, 22A) is sucked from the mold vacuum suction holes 21B, 22B provided in the mold cavities 21A, 22A of the divided molds 21, 22, as shown in FIG.
- the sheet-shaped resins S1 and S2 are adsorbed on the inner surfaces of the corresponding mold cavities 21A and 22A, respectively, so that the sheet-shaped resins S1 and S2 are respectively formed on the inner surfaces (molding surfaces) of the corresponding mold cavities 21A and 22A. ).
- the molding die including the split dies 21 and 22 and the intermediate die 23 is clamped.
- the divided molds 21 and 22 are butted via the intermediate mold 23 by the mold clamping. That is, one abutment surface 23 ⁇ / b> A of the intermediate mold 23 contacts the split mold 21, and the other abutment surface 23 ⁇ / b> B contacts the split mold 22.
- the sheet-shaped resin S1 is sandwiched between the one abutting surface 23A of the intermediate mold 23 and the split mold 21, and the sheet-like resin S1 is sandwiched between the other abutting surface 23B of the intermediate mold 23 and the split mold 22.
- the resin S2 is sandwiched between the molds 21A, 23B of the intermediate mold 23 along the outer peripheral edges of the mold cavities 21A, 22A of the divided molds 21, 22.
- Each of the sandwiched sheet-like resins S1 and S2 is cut off by the projections 23C and 23D.
- FIG. 6 shows molded articles 41 and 42 taken out of the mold.
- the molded products 41 and 42 formed by shaping the sheet-shaped resins S1 and S2 in the mold cavities 21A and 22A of the split molds 21 and 22 have burrs b on the outer periphery thereof.
- the cutout portions 41a and 42a having a small thickness are formed by the cutout by 23D.
- the cutout portions 41a and 42a can be easily cut off, and the burr b on the outer peripheral portion can be easily dropped.
- molding can be performed with twice the efficiency as compared with the case where one sheet of resin is molded. Deburring after molding is also easy. Together with these effects, it is possible to greatly improve the molding efficiency despite the simple change of interposing an intermediate mold.
- the molding method of the present embodiment is a closed space forming mold for forming a closed space by abutting the molding resin when forming the sheet resin extruded from the extruder by vacuum molding with the molding die.
- the molding apparatus used in the present embodiment includes an extruder 1 as shown in FIG. 7, and a sheet-like resin is extruded from the extruder 101 in a hanging manner.
- the extruder 101 includes a cylinder 112 provided with a hopper 111, a screw (not shown) provided in the cylinder 112, a hydraulic motor 113 connected to the screw, and an accumulator 114 that communicates with the cylinder 112. , A plunger 115 provided in the accumulator 114.
- the resin pellets supplied from the hopper 111 are melted and kneaded by the rotation of a screw by a hydraulic motor 113 in a cylinder 112, and the resin in a molten state is transferred to an accumulator 114 and stored in a fixed amount.
- the molten resin is sent toward the T-die 116 by driving the plunger 115, and the continuous sheet-shaped resin S is extruded through the extrusion slit 117, while being pressed by a pair of rollers 118 arranged at intervals. It is sent downward.
- a molding die 122 and a closed space forming die 140 are arranged so as to face each other.
- a plurality of vacuum suction holes 122B are formed in the molding die 122 so as to face the inner surface (molding surface) of the mold cavity 122A.
- a mold 132 is provided on the outer periphery of the molding die 122 so as to be able to advance and retreat.
- the mold frame 132 is also provided with a vacuum suction hole 132A facing the surface in contact with the sheet-shaped resin S.
- the closed space forming mold 140 is configured to abut the forming mold 122 to form a closed space.
- the closed space forming mold 141 is abutted against the forming mold 122, and the sheet resin S is discharged. By being sandwiched, the outer peripheral portion of the formed sheet-shaped resin S is cut off, so that the burr on the outside of the molded product can be easily removed.
- FIG. 8 is a view showing a shaping step of the sheet-shaped resin S.
- the sheet-shaped resin S is adsorbed on the inner surface of the cavity 122A of the molding die 122 and is along the inner surface (molding surface) of the mold cavity 122A. Shaped into shape. Further, the closed space forming mold 140 is abutted against the forming mold 122 to perform mold clamping, and the cooling air is shaped from the closed space forming mold 140 to form the sheet resin S forming mold. The surface opposite to the surface in contact with 122 is sprayed and cooled.
- a plurality of fins 141 are arranged and formed on the surface of the closed space forming mold 140 facing the forming mold 122, and the closed space forming mold 140 is abutted against the forming mold 122.
- the closed space formed is divided into elongated spaces by these fins 141. Thereby, the cooling efficiency is improved and the cooling is made uniform.
- FIG. 9 shows a surface of the closed space forming die 140 facing the molding die 122, and a plurality of (in this example) the opposite surface along the direction in which the sheet-shaped resin S hangs down. Of the fins 141 are arranged substantially in parallel.
- the closed space formed by abutting the closed space forming mold 140 against the molding die 122 is divided into four spaces as shown in FIG.
- an air supply port 142 for supplying air to a position above the closed space forming mold 140 in a direction in which the sheet-shaped resin S hangs is formed.
- An air outlet 143 serving as an air outlet is formed below the mold 140.
- the fin 141 serves as a rectifying plate, and as shown in FIGS. 8 and 10, air supplied from an air supply port 142 provided above the closed space forming mold 140 is rectified. In this state, the air flows downward in the elongated space divided by the fins 141, and is discharged from an air outlet 143 formed below the closed space forming mold 140.
- the fin 141 is provided on the closed space forming mold 140, and the closed space formed by abutting the closed space forming mold 140 against the forming mold 122 is divided into an elongated space, thereby providing air. And the sheet-like resin S is uniformly cooled. As a result, deformation of a molded product obtained by molding the sheet-shaped resin S is suppressed, and highly accurate vacuum molding is realized.
- air may flow from below to above.
- the direction of air flow may be alternately set to the opposite direction.
- the molding method of the second embodiment is applied to the molding method of the first embodiment.
- the intermediate mold is a mold for forming a closed space that forms a closed space with each of the divided molds, and fins are provided on the surface facing each divided mold.
- FIGS. 11 and 12 are diagrams for explaining the molding method in the present embodiment.
- the same members as those described in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and description thereof will be omitted.
- the characteristic feature of the present embodiment is that the intermediate mold 23 is a closed space forming mold that forms a closed space with each of the divided molds 21 and 22, and the opposing surface of each of the divided molds 21 and 22. Is provided with the fins 51.
- the intermediate mold 23 is annular, but in the present embodiment, the intermediate mold 23 has a surface facing each of the split molds 21 and 22. Is provided with a concave portion for forming a closed space.
- the intermediate mold 23 is sandwiched between the divided molds 21 and 22 and the mold is clamped, one surface of the intermediate mold 23 and the divided mold are separated. 21 forms a closed space, and the other surface of the intermediate mold 23 and the split mold 22 form a closed space.
- a plurality of fins 51 are arranged on the surface of the intermediate mold 23 facing the split mold 21 and the surface of the intermediate mold 23 facing the split mold 22.
- the fact that a plurality of (three in this example) fins 51 are arranged substantially in parallel with each other along the direction in which the sheet-shaped resin S hangs on the surface facing each of the split molds 21 and 22 is described above. This is the same as the second embodiment.
- an air supply port 52 for supplying air is formed at an upper position in a direction in which the sheet-shaped resin S hangs, and an air discharge port 53 serving as an air outlet is formed at a lower position. It is formed in the same manner as in the second embodiment. However, in the case of the present embodiment, since air needs to be supplied from both sides of the intermediate mold 23, an air supply port 52 is formed at the center of the upper end surface of the intermediate mold 23, and each divided port is branched from the air supply port 52. An opening 52a is formed on a surface facing the molds 21 and 22. Similarly, an air exhaust port 53 is formed at the center of the lower end surface of the intermediate mold 23, and an opening 53a is formed on the surface facing each of the split molds 21 and 22 so as to branch therefrom.
- the intermediate mold 23 as a mold for forming a closed space and forming the fins 51 on the surfaces facing the divided molds 21 and 22, the molding of the sheet-like resins S1 and S2 is performed as shown in FIG.
- the air flows downward in the elongated space divided by the fins 51 in a state where the air is rectified, and the same effect as in the second embodiment can be obtained.
- it is possible to simultaneously achieve significant improvement in molding efficiency and high-precision vacuum molding.
- the opposing closed space forming A slit 202A is provided in the mold 202, and the tip of a rib formed by projecting the protrusion pin 203 is sandwiched and supported by the slit 202A so that the rib does not fall down even if the protrusion pin 203 is retracted. I have.
- FIG. 14 shows a modified example.
- an insert part 204 is mounted on a mold 202 for forming a closed space, and the tip of a rib formed by protruding a protruding pin 203 is welded and supported.
- the insert component 204 is, for example, an injection molded product, a foam molded product, or the like.
- high ribs can be formed, and these ribs can be used as rectifying plates instead of fins.
- the inside of the closed space is divided by the rib, and efficient cooling is realized.
- the provision of an air supply port and an air exhaust port in the closed space forming mold 202 in each of the spaces divided by the ribs is the same as in the second and third embodiments.
- the intermediate mold 23 is a hollow annular mold, but is not limited to this, and may be a non-hollow (so-called solid) mold.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
[Problem] To provide a molding method with which it is possible to significantly improve molding efficiency.
[Solution] A first sheet-shaped resin and a second sheet-shaped resin in a molten state extruded from an extruder are directly dropped downward to be arranged between divided molds. Air between one divided mold and the first sheet-shaped resin is depressurized to bring the first sheet-shaped resin into intimate contact with a mold cavity of the one divided mold, and air between the other divided mold and the second sheet-shaped resin is depressurized to bring the second sheet-shaped resin into intimate contact with a mold cavity of the other divided mold. Mold closing is performed with an intermediate mold interposed between the divided molds brought into intimate contact with the respective sheet-shaped resins. The intermediate mold has protrusion parts butted against the outsides of outer edges of the mold cavities of the respective divided molds.
Description
本発明は、樹脂シートを真空成形する成形方法に関するものであり、特に、効率的に成形品を成形し得る成形方法に関する。
{Circle over (1)} The present invention relates to a molding method for vacuum molding a resin sheet, and more particularly to a molding method capable of efficiently molding a molded article.
各種成形品を成形する方法として、樹脂シートを熱成形(真空成形)する方法が知られている。例えば、特許文献1には、加熱軟化した成形用シートを成形面に凹凸を有する成形型に真空吸引手段により吸引当接させて成形するシートの真空成形方法が開示されており、シートを必要以上に伸びないようにして薄肉化を防止する技術が提案されている。
方法 As a method of molding various molded products, a method of thermoforming (vacuum molding) a resin sheet is known. For example, Patent Document 1 discloses a vacuum forming method of a sheet in which a heat-softened forming sheet is brought into suction contact with a forming die having irregularities on a forming surface by a vacuum suction means to form the sheet. There has been proposed a technique for preventing the thickness from becoming thin and preventing the thickness from being reduced.
この種の真空成形方法では、樹脂を予めシート化しておき、成形時に加熱することにより軟化した成形用シートを横置きにして成形を行うのが一般的であるが、より効率的な成形を実現するため、押出による一次成形と、真空による二次成形とを組み合わせた成形方法も提案されている。このような成形方法によれば、押出された溶融状態の樹脂シートをそのまま利用して、真空成形することにより、いったん成形した樹脂を再加熱することに起因する加熱の不均一性等の技術的問題点を引き起こすことなしに、成形品を成形することが可能である。
In this type of vacuum forming method, it is common to put the resin into a sheet in advance, and then place the sheet for molding softened by heating at the time of molding to perform the molding, but realize more efficient molding Therefore, a molding method combining primary molding by extrusion and secondary molding by vacuum has also been proposed. According to such a molding method, the extruded molten resin sheet is used as it is, and is vacuum-molded, so that the once molded resin is re-heated. It is possible to mold the part without causing problems.
特に、押出された溶融状態の樹脂シートをそのまま下方に垂下させ、鉛直方向に延びる樹脂シートを型締することにより真空成形することにより、たとえば樹脂を横方向に押出する場合に比べて、二次成形の型締まで溶融状態の樹脂シートを支持する必要なしに非接触状態で押出ダイより送り出すことが可能である。
In particular, the extruded molten resin sheet is drooped downward as it is, and the vertically extending resin sheet is clamped to form a vacuum so that the resin is extruded in the secondary direction, as compared with the case where the resin is extruded in the lateral direction. It is possible to feed the resin sheet out of the extrusion die in a non-contact state without having to support the molten resin sheet until the mold is closed.
近年、プラスチック成形の分野においては、成形効率の一層の向上が求められており、押出された溶融状態の樹脂シートをそのまま下方に垂下させ、鉛直方向に延びる樹脂シートを型締することにより真空成形する方法においても、その改良が望まれている。
In recent years, in the field of plastic molding, further improvement in molding efficiency has been demanded, and the extruded molten resin sheet is drooped downward as it is, and the vertically extending resin sheet is clamped by vacuum forming. There is also a demand for an improved method.
本発明は、前述の従来の実情に鑑みて提案されたものであり、成形効率を著しく向上することが可能な成形方法を提供することを目的とする。
The present invention has been proposed in view of the above-mentioned conventional circumstances, and has as its object to provide a molding method capable of significantly improving molding efficiency.
前述の目的を達成するために、本願の第1の発明の成形方法は、押出機より押出された溶融状態の第1のシート状樹脂および第2のシート状樹脂をそのまま下方に垂下させて分割金型間に配置し、一方の分割金型と第1シート状樹脂の間の空気を減圧することによって第1シート状樹脂を一方の分割金型の金型キャビティに密着させるとともに、他方の分割金型と第2シート状樹脂の間の空気を減圧することによって第2シート状樹脂を他方の分割金型の金型キャビティに密着させ、各シート状樹脂を密着させた分割金型間に中間金型を介在させ、型締めすることを特徴とする。
In order to achieve the above object, a molding method according to a first invention of the present application is a method in which a molten first sheet-like resin and a second sheet-like resin extruded from an extruder are directly dropped downward and divided. The first sheet-shaped resin is placed between the molds, and the air between the one divided mold and the first sheet-shaped resin is depressurized to bring the first sheet-shaped resin into close contact with the mold cavity of one of the divided molds, while the other divided The second sheet-shaped resin is brought into close contact with the mold cavity of the other divided mold by reducing the pressure of the air between the mold and the second sheet-shaped resin. It is characterized in that the mold is interposed and the mold is clamped.
本願の第1の発明の成形方法では、2枚のシート状樹脂を2つの分割金型により同時に真空成形しているので、1枚のシート状樹脂を成形する場合に比べて、2倍の成形効率が得られる。また、真空成形においては、成形品の周囲に残存するバリの処理が問題になるが、本発明の成形方法では、中間金型を介在させて型締めしているので、各分割金型に周囲において、シート状樹脂が食い切られる形になり、バリの処理も容易である。
In the molding method of the first invention of the present application, two sheet-shaped resins are simultaneously vacuum-formed by two split molds, so that the molding is performed twice as much as in the case of molding one sheet-shaped resin. Efficiency is obtained. In vacuum molding, the treatment of burrs remaining around the molded article becomes a problem. However, in the molding method of the present invention, since the intermediate mold is interposed and the mold is clamped, the peripheral mold is formed around each divided mold. In this case, the sheet-shaped resin is cut off, and the burr treatment is easy.
一方、押出された溶融状態の樹脂シートをそのまま下方に垂下させ、鉛直方向に延びる樹脂シートを型締することにより真空成形する方法では、例えば凹型の成形品を成形する場合、冷却の不均一さから成形品が変形する等の不都合が生ずることがある。真空成形において、分割された金型を用いる場合、シート状樹脂の金型に賦形されていない面を冷却する手法としては、パーティングラインによって区切られた閉空間全体に対して、冷媒の出入り口を1~2系統程度設け、対流を起こさせることが考えられる。しかしながら、この場合には流体(冷媒)の流れを規制することができず、場所により流体速度の不均一が生じ易く、また、淀み点の発生等により全体を均一に冷却することができない。
On the other hand, in the method in which the extruded molten resin sheet is dripped downward as it is, and the resin sheet extending in the vertical direction is clamped by vacuum forming, for example, when a concave molded product is formed, uneven cooling may occur. In some cases, inconveniences such as deformation of the molded product may occur. In the vacuum molding, when using a divided mold, as a method of cooling the surface of the sheet-shaped resin that is not formed in the mold, the entrance and exit of the refrigerant with respect to the entire closed space partitioned by the parting line. It is conceivable to provide convection by providing about one or two systems. However, in this case, the flow of the fluid (refrigerant) cannot be regulated, and the fluid velocity tends to be uneven in some places, and the whole cannot be uniformly cooled due to the occurrence of a stagnation point or the like.
このような不都合を解消するために案出されたのが、本願の第2の発明である。すなわち、本願の第2の発明の成形方法は、押出機より押出された溶融状態のシート状樹脂を下方に垂下させて成形用金型と閉空間形成用金型の間に配置し、成形用金型とシート状樹脂の間の空気を減圧することによってシート状樹脂を成形用金型の金型キャビティに密着させるに際し、閉空間形成用金型の成形用金型との対向面に複数のフィンを略並列に配列形成し、これらフィンにより分割された各領域において、当該閉空間形成用金型側からエアーによる冷却を行うことを特徴とする。
第 The second invention of the present application has been devised to solve such inconvenience. That is, in the molding method of the second invention of the present application, the molten sheet-like resin extruded from the extruder is suspended downward, and disposed between the molding die and the closed space forming die. When the sheet-shaped resin is brought into close contact with the mold cavity of the molding die by reducing the pressure between the mold and the sheet-shaped resin, a plurality of surfaces are formed on the surface of the closed space forming mold facing the molding die. The fins are arranged substantially in parallel, and in each area divided by the fins, cooling by air is performed from the closed space forming mold side.
さらに、本願の第2の発明の構成を本願の第1の発明の構成と組み合わせることも可能である。これが本願の第3の発明である。すなわち、本願の第3の発明の成形方法は、押出機より押出された溶融状態の第1のシート状樹脂および第2のシート状樹脂をそのまま下方に垂下させて分割金型間に配置し、一方の分割金型と第1シート状樹脂の間の空気を減圧することによって第1シート状樹脂を一方の分割金型の金型キャビティに密着させるとともに、他方の分割金型と第2シート状樹脂の間の空気を減圧することによって第2シート状樹脂を他方の分割金型の金型キャビティに密着させ、各シート状樹脂を密着させた分割金型間に各分割金型との対向面に複数のフィンを略並列に配列形成した中間金型を介在させ、型締めした後、中間金型側からエアーによる冷却を行うことを特徴とする。
Furthermore, the configuration of the second invention of the present application can be combined with the configuration of the first invention of the present application. This is the third invention of the present application. That is, in the molding method of the third invention of the present application, the first sheet resin and the second sheet resin in a molten state extruded from an extruder are drooped downward as they are and arranged between the split molds, The first sheet-shaped resin is brought into close contact with the mold cavity of one of the divided molds by reducing the pressure of the air between one divided mold and the first sheet-shaped resin, and the other divided mold and the second sheet-shaped resin. The second sheet-shaped resin is brought into close contact with the mold cavity of the other divided mold by reducing the pressure of the air between the resins, and the facing surface of each divided mold with each sheet-shaped resin facing each divided mold. In this method, an intermediate mold having a plurality of fins arranged substantially in parallel is interposed therebetween, and after clamping, the mold is cooled by air from the intermediate mold side.
本願の第2の発明及び第3の発明の成形方法では、整流のためのフィンを設けて冷媒(エアー)による冷却を行っているので、フィンによって規制された空間に冷媒が流される形になり、冷媒の速度が向上されることや冷媒の流れを乱流にし易いこと等が相俟って、シート状樹脂の金型に賦形されていない面がより均一にかつ速やかに冷却され、精度の高い真空成形が実現される。
In the molding method according to the second and third aspects of the present invention, fins for rectification are provided to perform cooling by the refrigerant (air), so that the refrigerant flows into the space regulated by the fins. Combined with the fact that the speed of the refrigerant is improved and that the flow of the refrigerant is likely to be turbulent, the surface of the sheet-shaped resin that is not shaped in the mold is cooled more uniformly and promptly, and the accuracy is improved. High vacuum forming is realized.
本願の第1の発明によれば、1枚ずつシート状樹脂を成形する方法に比べて、成形効率を著しく向上することが可能な成形方法を提供することが可能である。また、本発明によれば、バリの処理も容易であり、この点においても成形効率を向上することができる。
According to the first invention of the present application, it is possible to provide a molding method capable of significantly improving molding efficiency as compared with a method of molding a sheet-like resin one by one. Further, according to the present invention, burr treatment is easy, and in this regard, molding efficiency can be improved.
本願の第2の発明によれば、冷却の不均一性に起因する変形の発生を抑えることができ、精度の高い真空成形を実現することが可能である。
According to the second aspect of the present invention, it is possible to suppress the occurrence of deformation due to non-uniform cooling, and to realize highly accurate vacuum forming.
以下、本発明を適用した成形方法の実施形態について、図面を参照しながら詳細に説明する。
Hereinafter, an embodiment of a molding method to which the present invention is applied will be described in detail with reference to the drawings.
(第1の実施形態)
本実施形態の成形方法は、押出機より押出された2枚のシート状樹脂を、金型キャビティを互いに対向して配置された2つの分割金型により同時に真空成形するものである。したがって、一度の型締めにより2つの成形品を同時に成形することができ、通常の真空成形に比べて2倍の成形効率を実現することができる。 (First embodiment)
In the molding method of the present embodiment, two sheet-like resins extruded from an extruder are simultaneously vacuum-molded by two split molds having mold cavities opposed to each other. Therefore, two molded products can be molded simultaneously by one-time clamping, and a molding efficiency twice as high as that of ordinary vacuum molding can be realized.
本実施形態の成形方法は、押出機より押出された2枚のシート状樹脂を、金型キャビティを互いに対向して配置された2つの分割金型により同時に真空成形するものである。したがって、一度の型締めにより2つの成形品を同時に成形することができ、通常の真空成形に比べて2倍の成形効率を実現することができる。 (First embodiment)
In the molding method of the present embodiment, two sheet-like resins extruded from an extruder are simultaneously vacuum-molded by two split molds having mold cavities opposed to each other. Therefore, two molded products can be molded simultaneously by one-time clamping, and a molding efficiency twice as high as that of ordinary vacuum molding can be realized.
ここで、先ず本実施形態の成形に用いられる成形装置について説明すると、成形装置は、図1に示すように、押出機1を2基備えており、これら押出機1からそれぞれシート状樹脂が垂下する形で押し出される。
Here, first, the molding apparatus used in the molding of the present embodiment will be described. As shown in FIG. 1, the molding apparatus includes two extruders 1 from which the sheet-shaped resin droops from each of the extruders 1. It is extruded in the form.
各押出機1は、従来既知のタイプであり、その詳しい説明は省略するが、ホッパー11が付設されたシリンダー12と、シリンダー12内に設けられたスクリュー(図示せず)と、スクリューに連結された油圧モーター13と、シリンダー12と内部が連通したアキュムレータ14と、アキュムレータ14内に設けられたプランジャー15とを有し、ホッパー11から投入された樹脂ペレットが、シリンダー12内で油圧モーター13によるスクリューの回転により溶融、混練され、溶融状態の樹脂がアキュムレータ14に移送されて一定量貯留され、プランジャー15の駆動によりTダイ16に向けて溶融樹脂を送り、押出スリット17を通じて連続的なシート状樹脂が押し出され、間隔を隔てて配置された一対のローラー18によって挟圧されながら下方へ向かって送り出される。
Each extruder 1 is a conventionally known type, and detailed description thereof is omitted, but a cylinder 12 provided with a hopper 11, a screw (not shown) provided in the cylinder 12, and a screw connected to the screw. A hydraulic motor 13, an accumulator 14 in which the inside of the cylinder 12 communicates with the cylinder 12, and a plunger 15 provided in the accumulator 14. The molten resin is melted and kneaded by the rotation of the screw, and the molten resin is transferred to the accumulator 14 and stored in a certain amount. The molten resin is sent toward the T-die 16 by driving the plunger 15, and the continuous Resin is extruded, and a pair of rollers 18 are arranged at intervals. While being pressed is fed downward.
押出機1の下方には、2つの分割金型21、22が金型キャビティ21A、22Aが互いに対向するように配置され、さらに、これら2つの分割金型21、22に中間金型23が配置されている。各分割金型21、22には、金型キャビティ21A、22Aの内面(成形面)に臨む形で複数の真空吸引孔21B、22Bが形成されている。また、各分割金型21、22の外周部には、型枠31、32が進退自在に設置されている。なお、型枠31、32にもそれぞれ真空吸引孔31A、32Aがシート状樹脂と接する面に臨んで設けられている。
Below the extruder 1, two split molds 21 and 22 are arranged so that the mold cavities 21A and 22A are opposed to each other, and an intermediate mold 23 is arranged on these two split molds 21 and 22. Have been. Each of the split molds 21 and 22 has a plurality of vacuum suction holes 21B and 22B facing the inner surfaces (molding surfaces) of the mold cavities 21A and 22A. Further, on the outer peripheral portion of each of the split molds 21 and 22, molds 31 and 32 are provided so as to be able to advance and retreat. In addition, the vacuum suction holes 31A and 32A are also provided in the mold frames 31 and 32, respectively, facing the surfaces in contact with the sheet-like resin.
中間金型23は、一方の突き当て面23Aが分割金型21と当接し、他方の突き当て面23Bが分割金型22と当接するものであり、各突き当て面23A、23bには、各分割金型21、22の金型キャビティ21A、22Aの外周縁の外側に沿って突き当てられる突出部23C、23Dを有している。中間金型23の突出部23C、23Dが分割金型21、22の金型キャビティ21A、22Aの外側に突き当てられ、シート状樹脂が挟み込まれることで、成形されたシート状樹脂の外周部分が食い切られる形になり、成形品の外側のバリの除去が容易なものとなる。
The intermediate mold 23 has one abutment surface 23A in contact with the split mold 21 and the other abutment surface 23B in contact with the split mold 22. Each abutment surface 23A, 23b has The split molds 21 and 22 have protrusions 23C and 23D which are abutted along the outer periphery of the mold cavities 21A and 22A. The projecting portions 23C and 23D of the intermediate mold 23 abut against the outside of the mold cavities 21A and 22A of the split molds 21 and 22, and the sheet-like resin is sandwiched, so that the outer peripheral portion of the formed sheet-like resin is reduced. It becomes a cut-out shape, and it becomes easy to remove burrs on the outside of the molded product.
また、本実施形態において、中間金型23は、分割金型21、22の金型キャビティ21A、22Aの形状に応じて、その外周形状に対応した環状の構造を有している。すなわち、中間金型23は、その中央部分がくり抜かれた形状をしている。このように中間金型23を中空の環状構造とすることにより、金型原料の削減によるコストの削減や、成形装置の軽量化に繋がるという利点を有する。
In addition, in the present embodiment, the intermediate mold 23 has an annular structure corresponding to the outer peripheral shape thereof according to the shapes of the mold cavities 21A and 22A of the split molds 21 and 22. That is, the intermediate mold 23 has a shape in which the center portion is hollowed out. By forming the intermediate mold 23 as a hollow annular structure as described above, there is an advantage in that cost can be reduced due to reduction of mold raw materials and the molding device can be reduced in weight.
なお、前述の成形装置は、真空成形を基本とするものであり、したがって、中間金型23にはエアーの吹き出し機構等の特別な機構は不要である。
The above-described molding apparatus is based on vacuum molding, and therefore, the intermediate mold 23 does not require a special mechanism such as an air blowing mechanism.
次に、本実施形態の成形方法における成形工程について、工程順に説明する。
Next, the molding steps in the molding method of the present embodiment will be described in the order of the steps.
本実施形態の成形方法では、先ず、図1に示すように、各押出機1の押出スリット17から連続的にシート状樹脂S1、S2を押し出す。押し出されたシート状樹脂S1、S2においては、それぞれのシート状樹脂S1、S2の押出速度に応じて、この押出速度と、シート状樹脂S1、S2が一対のローラー18により下方に送り出される送り出し速度との相対速度差を一対のローラー18の回転速度を調整することにより調整し、シート状樹脂S1、S2が一対のローラー18の間を通過する際、一対のローラー18により下方に引っ張られ、それによりシート状樹脂S1、S2が延伸薄肉化され、その結果、ドローダウンあるいはネックインの発生を有効に防止するようにしている。なお、一対のローラー18の回転数の調整とともに、押出スリット17の間隔の調整を連動して行ってもよい。
In the molding method according to the present embodiment, first, as shown in FIG. 1, the sheet resins S1 and S2 are continuously extruded from the extrusion slit 17 of each extruder 1. In the extruded sheet resins S1 and S2, the extrusion speed and the feeding speed at which the sheet resins S1 and S2 are fed downward by the pair of rollers 18 according to the extrusion speed of the respective sheet resins S1 and S2. Is adjusted by adjusting the rotation speed of the pair of rollers 18, and when the sheet-like resins S <b> 1 and S <b> 2 pass between the pair of rollers 18, the sheet-like resins S <b> 1 and S <b> 2 are pulled downward by the pair of rollers 18. As a result, the sheet-like resins S1 and S2 are stretched and thinned, and as a result, drawdown or neck-in is effectively prevented. The adjustment of the interval between the extrusion slits 17 may be performed in conjunction with the adjustment of the rotation speed of the pair of rollers 18.
シート状樹脂S1、S2に使用される熱可塑性プラスチック材料は、任意であるが、例示するならば、例えばポリエチレン樹脂、ポリプロピレン樹脂、エチレン-酢酸ビニル共重合体、塩化ビニル樹脂、ABS樹脂(アクリロニトリル-スチレン-ブタジエン樹脂)、ポリアミド樹脂、ポリスチレン樹脂、ポリエステル樹脂、さらにはポリカーボネート、変性ポリフェニレンエーテル等のエンジニアリングプラスチックス等を挙げることができる。また、発泡樹脂等も使用可能である。
The thermoplastic material used for the sheet-like resins S1 and S2 is arbitrary. For example, a polyethylene resin, a polypropylene resin, an ethylene-vinyl acetate copolymer, a vinyl chloride resin, an ABS resin (acrylonitrile- (Styrene-butadiene resin), polyamide resin, polystyrene resin, polyester resin, and engineering plastics such as polycarbonate and modified polyphenylene ether. Further, a foamed resin or the like can be used.
各押出機1の押出スリット17から押し出され、延伸薄肉化されたシート状樹脂S1、S2は、各分割金型21、22と中間金型23の間に垂下される。この時点では、各分割金型21、22に設けられた型枠31、32は、後退した状態である。すなわち、各型枠31、32の先端面は、分割金型21,22の対向面と概ね面一の状態である。
シ ー ト The sheet resins S1 and S2 which are extruded from the extrusion slits 17 of the respective extruders 1 and stretched and thinned are suspended between the split molds 21 and 22 and the intermediate mold 23. At this time, the mold frames 31 and 32 provided in each of the split molds 21 and 22 are in a retracted state. That is, the tip surfaces of the mold frames 31 and 32 are substantially flush with the opposing surfaces of the split molds 21 and 22.
次いで、図2に示すように、分割金型21、22のそれぞれの型枠31、32を前進させ(すなわち、シート状樹脂S1、S2に向かって移動させ)、各シート状樹脂S1、S2の主面に当接させる。この時、各型枠31、32に設けられた真空吸引孔31A、32Aにより真空吸引を行い、各シート状樹脂S1、S2を型枠31、32に吸着させる。これにより、それぞれのシート状樹脂S1、S2、対応する型枠31、32及び金型キャビティ21A、22Aにより、密閉空間が形成される。
Next, as shown in FIG. 2, the molds 31 and 32 of the split molds 21 and 22 are advanced (that is, moved toward the sheet-like resins S1 and S2), and each of the sheet-like resins S1 and S2 is moved. Make contact with the main surface. At this time, vacuum suction is performed by the vacuum suction holes 31A and 32A provided in the molds 31 and 32, and the sheet-shaped resins S1 and S2 are adsorbed to the molds 31 and 32. As a result, a sealed space is formed by the respective sheet-shaped resins S1, S2, the corresponding molds 31, 32, and the mold cavities 21A, 22A.
続いて、図3に示すように、シート状樹脂S1、S2を吸着した状態で型枠31、32を元の位置まで後退させ、シート状樹脂S1、S2を分割金型21、22に当接させた後、分割金型21、22の金型キャビティ21A、22Aに設けられた金型真空吸引孔21B、22Bからの吸引を開始する。
Subsequently, as shown in FIG. 3, the molds 31 and 32 are retracted to their original positions in a state where the sheet-shaped resins S1 and S2 are sucked, and the sheet-shaped resins S1 and S2 are brought into contact with the split molds 21 and 22. After that, suction from the mold vacuum suction holes 21B and 22B provided in the mold cavities 21A and 22A of the split molds 21 and 22 is started.
密閉空間(金型キャビティ21A、22A)内の空気を各分割金型21、22の金型キャビティ21A、22Aに設けられた金型真空吸引孔21B、22Bから吸引することにより、図4に示すように、各シート状樹脂S1、S2はそれぞれ対応する金型キャビティ21A、22Aの内面に吸着され、それによりシート状樹脂S1、S2はそれぞれ、対応する金型キャビティ21A、22Aの内面(成形面)に沿った形状に賦形される。
The air in the sealed spaces ( mold cavities 21A, 22A) is sucked from the mold vacuum suction holes 21B, 22B provided in the mold cavities 21A, 22A of the divided molds 21, 22, as shown in FIG. As described above, the sheet-shaped resins S1 and S2 are adsorbed on the inner surfaces of the corresponding mold cavities 21A and 22A, respectively, so that the sheet-shaped resins S1 and S2 are respectively formed on the inner surfaces (molding surfaces) of the corresponding mold cavities 21A and 22A. ).
次に、図5に示すように、前記分割金型21、22及び中間金型23からなる成形用金型の型締めを行う。型締めにより分割金型21,22は中間金型23を介して突き合わされる。すなわち、中間金型23の一方の突き当て面23Aが分割金型21と当接し、他方の突き当て面23Bが分割金型22と当接する。その結果、中間金型23の一方の突き当て面23Aと分割金型21の間にシート状樹脂S1が挟み込まれ、中間金型23の他方の突き当て面23Bと分割金型22の間にシート状樹脂S2が挟み込まれることになるが、中間金型23の各突き当て面23A、23bには、各分割金型21、22の金型キャビティ21A、22Aの外周縁の外側に沿って突き当てられる突出部23C、23Dを有していることから、挟み込まれた各シート状樹脂S1,S2は、これら突出部23C、23Dにより食い切られる形となる。
(5) Next, as shown in FIG. 5, the molding die including the split dies 21 and 22 and the intermediate die 23 is clamped. The divided molds 21 and 22 are butted via the intermediate mold 23 by the mold clamping. That is, one abutment surface 23 </ b> A of the intermediate mold 23 contacts the split mold 21, and the other abutment surface 23 </ b> B contacts the split mold 22. As a result, the sheet-shaped resin S1 is sandwiched between the one abutting surface 23A of the intermediate mold 23 and the split mold 21, and the sheet-like resin S1 is sandwiched between the other abutting surface 23B of the intermediate mold 23 and the split mold 22. The resin S2 is sandwiched between the molds 21A, 23B of the intermediate mold 23 along the outer peripheral edges of the mold cavities 21A, 22A of the divided molds 21, 22. Each of the sandwiched sheet-like resins S1 and S2 is cut off by the projections 23C and 23D.
図6は、金型から取り出した成形品41、42を示すものである。シート状樹脂S1,S2が分割金型21、22の金型キャビティ21A、22Aで賦形されて形成された成形品41、42は、その外周部分にバリbを有するが、前記突出部23C、23Dによる食い切りにより、厚さの薄い食い切り部41a、42aが形成されている。この食い切り部41a、42aは、簡単に切除することができ、外周部分のバリbを容易に脱落させることができる。
FIG. 6 shows molded articles 41 and 42 taken out of the mold. The molded products 41 and 42 formed by shaping the sheet-shaped resins S1 and S2 in the mold cavities 21A and 22A of the split molds 21 and 22 have burrs b on the outer periphery thereof. The cutout portions 41a and 42a having a small thickness are formed by the cutout by 23D. The cutout portions 41a and 42a can be easily cut off, and the burr b on the outer peripheral portion can be easily dropped.
前述の実施形態においては、1枚のシート状樹脂を成形する場合に比べて、2倍の効率で成形を行うことができる。また、成形後のバリ取りも容易である。これらの効果が相俟って、中間金型を介在させるという簡易な変更にも関わらず、成形効率の大幅な向上が可能である。
In the above-described embodiment, molding can be performed with twice the efficiency as compared with the case where one sheet of resin is molded. Deburring after molding is also easy. Together with these effects, it is possible to greatly improve the molding efficiency despite the simple change of interposing an intermediate mold.
(第2の実施形態)
本実施形態の成形方法は、押出機より押出されたシート状樹脂を、成形用金型で真空成形する際に、成形用金型に突き合わせて閉空間を形成するための閉空間形成用金型に整流用のフィンを設け、均一な冷却を実現するものである。 (Second embodiment)
The molding method of the present embodiment is a closed space forming mold for forming a closed space by abutting the molding resin when forming the sheet resin extruded from the extruder by vacuum molding with the molding die. Are provided with rectifying fins to achieve uniform cooling.
本実施形態の成形方法は、押出機より押出されたシート状樹脂を、成形用金型で真空成形する際に、成形用金型に突き合わせて閉空間を形成するための閉空間形成用金型に整流用のフィンを設け、均一な冷却を実現するものである。 (Second embodiment)
The molding method of the present embodiment is a closed space forming mold for forming a closed space by abutting the molding resin when forming the sheet resin extruded from the extruder by vacuum molding with the molding die. Are provided with rectifying fins to achieve uniform cooling.
本実施形態で用いられる成形装置は、図7に示すように、押出機1を備えており、押出機101からシート状樹脂が垂下する形で押し出される。押出機101は、ホッパー111が付設されたシリンダー112と、シリンダー112内に設けられたスクリュー(図示せず)と、スクリューに連結された油圧モーター113と、シリンダー112と内部が連通したアキュムレータ114と、アキュムレータ114内に設けられたプランジャー115とを有する。ホッパー111から投入された樹脂ペレットは、シリンダー112内で油圧モーター113によるスクリューの回転により溶融、混練され、溶融状態の樹脂がアキュムレータ114に移送されて一定量貯留される。その後、プランジャー115の駆動によりTダイ116に向けて溶融樹脂を送り、押出スリット117を通じて連続的なシート状樹脂Sが押し出され、間隔を隔てて配置された一対のローラー118によって挟圧されながら下方へ向かって送り出される。
成形 The molding apparatus used in the present embodiment includes an extruder 1 as shown in FIG. 7, and a sheet-like resin is extruded from the extruder 101 in a hanging manner. The extruder 101 includes a cylinder 112 provided with a hopper 111, a screw (not shown) provided in the cylinder 112, a hydraulic motor 113 connected to the screw, and an accumulator 114 that communicates with the cylinder 112. , A plunger 115 provided in the accumulator 114. The resin pellets supplied from the hopper 111 are melted and kneaded by the rotation of a screw by a hydraulic motor 113 in a cylinder 112, and the resin in a molten state is transferred to an accumulator 114 and stored in a fixed amount. Thereafter, the molten resin is sent toward the T-die 116 by driving the plunger 115, and the continuous sheet-shaped resin S is extruded through the extrusion slit 117, while being pressed by a pair of rollers 118 arranged at intervals. It is sent downward.
押出機101の下方には、成形用金型122と閉空間形成用金型140が互いに対向するように配置されている。成形用金型122には、金型キャビティ122Aの内面(成形面)に臨む形で複数の真空吸引孔122Bが形成されている。また、成形用金型122の外周部には、型枠132が進退自在に設置されている。なお、型枠132にも真空吸引孔132Aがシート状樹脂Sと接する面に臨んで設けられている。
成形 Below the extruder 101, a molding die 122 and a closed space forming die 140 are arranged so as to face each other. A plurality of vacuum suction holes 122B are formed in the molding die 122 so as to face the inner surface (molding surface) of the mold cavity 122A. A mold 132 is provided on the outer periphery of the molding die 122 so as to be able to advance and retreat. The mold frame 132 is also provided with a vacuum suction hole 132A facing the surface in contact with the sheet-shaped resin S.
閉空間形成用金型140は、成形用金型122と当接して閉空間を構成するものであり、閉空間形成用金型141が成形用金型122に突き当てられ、シート状樹脂Sが挟み込まれることで、成形されたシート状樹脂Sの外周部分が食い切られる形になり、成形品の外側のバリの除去が容易なものとなる。
The closed space forming mold 140 is configured to abut the forming mold 122 to form a closed space. The closed space forming mold 141 is abutted against the forming mold 122, and the sheet resin S is discharged. By being sandwiched, the outer peripheral portion of the formed sheet-shaped resin S is cut off, so that the burr on the outside of the molded product can be easily removed.
図8は、シート状樹脂Sの賦形工程を示す図であり、シート状樹脂Sは成形用金型122のキャビティ122Aの内面に吸着され、金型キャビティ122Aの内面(成形面)に沿った形状に賦形される。さらに、成形用金型122に閉空間形成用金型140を突き当てて型締めを行い、閉空間形成用金型140から冷却用のエアーを賦形されたシート状樹脂Sの成形用金型122と接する面とは反対側の面に吹き付けて冷却する。
FIG. 8 is a view showing a shaping step of the sheet-shaped resin S. The sheet-shaped resin S is adsorbed on the inner surface of the cavity 122A of the molding die 122 and is along the inner surface (molding surface) of the mold cavity 122A. Shaped into shape. Further, the closed space forming mold 140 is abutted against the forming mold 122 to perform mold clamping, and the cooling air is shaped from the closed space forming mold 140 to form the sheet resin S forming mold. The surface opposite to the surface in contact with 122 is sprayed and cooled.
この時、閉空間形成用金型140の成形用金型122との対向面に複数のフィン141を配列形成しておき、成形用金型122に閉空間形成用金型140を突き当てることで形成される閉空間をこれらフィン141で細長い空間に分割する。これにより冷却効率の向上や冷却の均一化が図られる。
At this time, a plurality of fins 141 are arranged and formed on the surface of the closed space forming mold 140 facing the forming mold 122, and the closed space forming mold 140 is abutted against the forming mold 122. The closed space formed is divided into elongated spaces by these fins 141. Thereby, the cooling efficiency is improved and the cooling is made uniform.
図9は、閉空間形成用金型140の成形用金型122との対向面を示すものであり、当該対向面には、シート状樹脂Sが垂下される方向に沿って、複数(本例では3枚)のフィン141が略並列に配列形成されている。これにより、成形用金型122に閉空間形成用金型140を突き当てることで形成される閉空間は、図10に示すように、4つの空間に分割される。そして、分割された各空間には、シート状樹脂Sが垂下される方向おいて、閉空間形成用金型140の上方位置にエアーを供給するエアー供給口142が形成され、閉空間形成用金型140の下方位置にエアーの出口となるエアー排出口143が形成されている。
FIG. 9 shows a surface of the closed space forming die 140 facing the molding die 122, and a plurality of (in this example) the opposite surface along the direction in which the sheet-shaped resin S hangs down. Of the fins 141 are arranged substantially in parallel. Thus, the closed space formed by abutting the closed space forming mold 140 against the molding die 122 is divided into four spaces as shown in FIG. In each of the divided spaces, an air supply port 142 for supplying air to a position above the closed space forming mold 140 in a direction in which the sheet-shaped resin S hangs is formed. An air outlet 143 serving as an air outlet is formed below the mold 140.
前記フィン141は、整流板としての役割を果たし、図8や図10に示すように、閉空間形成用金型140の上方位置に設けたエアー供給口142から供給されるエアーは、整流された状態でフィン141により分割された細長い空間を下方に向かって流通し、閉空間形成用金型140の下方位置に形成されたエアー排出口143から排出される。
The fin 141 serves as a rectifying plate, and as shown in FIGS. 8 and 10, air supplied from an air supply port 142 provided above the closed space forming mold 140 is rectified. In this state, the air flows downward in the elongated space divided by the fins 141, and is discharged from an air outlet 143 formed below the closed space forming mold 140.
以上のように閉空間形成用金型140にフィン141を設け、成形用金型122に閉空間形成用金型140を突き当てることで形成される閉空間を細長い空間に分割することで、エアーの流れが均一になり、シート状樹脂Sが均一に冷却される。その結果、シート状樹脂Sが成形されることで得られる成形品における変形の発生が抑えられ、精度の高い真空成形が実現される。
As described above, the fin 141 is provided on the closed space forming mold 140, and the closed space formed by abutting the closed space forming mold 140 against the forming mold 122 is divided into an elongated space, thereby providing air. And the sheet-like resin S is uniformly cooled. As a result, deformation of a molded product obtained by molding the sheet-shaped resin S is suppressed, and highly accurate vacuum molding is realized.
なお、本実施形態の成形方法では、フィン141により分割された細長い空間において、上方から下方に向かってエアーが流通するようにしたが、逆に下方から上方に向かってエアーが流通してもよい。さらには、フィン141により分割された細長い空間において、エアーの流通する方向を交互に反対方向としてもよい。
In the molding method of the present embodiment, in the elongated space divided by the fin 141, air flows from above to below. However, air may flow from below to above. . Further, in the elongated space divided by the fins 141, the direction of air flow may be alternately set to the opposite direction.
(第3の実施形態)
本実施形態は、第1の実施形態の成形方法に第2の実施形態の成形方法を適用したものである。第1の実施形態との相違は、中間金型を各分割金型と閉空間を形成する閉空間形成用金型とし、各分割金型との対向面にフィンを設けたことである。 (Third embodiment)
In the present embodiment, the molding method of the second embodiment is applied to the molding method of the first embodiment. The difference from the first embodiment is that the intermediate mold is a mold for forming a closed space that forms a closed space with each of the divided molds, and fins are provided on the surface facing each divided mold.
本実施形態は、第1の実施形態の成形方法に第2の実施形態の成形方法を適用したものである。第1の実施形態との相違は、中間金型を各分割金型と閉空間を形成する閉空間形成用金型とし、各分割金型との対向面にフィンを設けたことである。 (Third embodiment)
In the present embodiment, the molding method of the second embodiment is applied to the molding method of the first embodiment. The difference from the first embodiment is that the intermediate mold is a mold for forming a closed space that forms a closed space with each of the divided molds, and fins are provided on the surface facing each divided mold.
図11及び図12は、本実施形態における成形方法を説明するための図である。なお、先の第1の実施形態で説明した部材と同一の部材については、先の第1の実施形態と同一の符号を付して、その説明は省略する。
FIGS. 11 and 12 are diagrams for explaining the molding method in the present embodiment. The same members as those described in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and description thereof will be omitted.
本実施形態の特徴的事項は、前述の通り、中間金型23を各分割金型21,22と閉空間を形成する閉空間形成用金型とし、各分割金型21,22との対向面にフィン51を設けたことである。
As described above, the characteristic feature of the present embodiment is that the intermediate mold 23 is a closed space forming mold that forms a closed space with each of the divided molds 21 and 22, and the opposing surface of each of the divided molds 21 and 22. Is provided with the fins 51.
この点について詳述すると、先の第1の実施形態では、中間金型23は円環状であったが、本実施形態では、中間金型23は、各分割金型21,22と対向する面に閉空間を形成するための凹部が設けられており、分割金型21,22の間に中間金型23を挟み込んで型締めした際には、中間金型23の一方の面と分割金型21により閉空間が形成され、中間金型23の他方の面と分割金型22により閉空間が形成される。
To explain this point in detail, in the first embodiment, the intermediate mold 23 is annular, but in the present embodiment, the intermediate mold 23 has a surface facing each of the split molds 21 and 22. Is provided with a concave portion for forming a closed space. When the intermediate mold 23 is sandwiched between the divided molds 21 and 22 and the mold is clamped, one surface of the intermediate mold 23 and the divided mold are separated. 21 forms a closed space, and the other surface of the intermediate mold 23 and the split mold 22 form a closed space.
そして、中間金型23の分割金型21との対向面、及び中間金型23の分割金型22との対向面には、それぞれ複数のフィン51が配列形成されている。各分割金型21,22との対向面において、シート状樹脂Sが垂下される方向に沿って複数(本例では3枚)のフィン51が略並列に配列形成されていることは先の第2の実施形態と同様である。
A plurality of fins 51 are arranged on the surface of the intermediate mold 23 facing the split mold 21 and the surface of the intermediate mold 23 facing the split mold 22. The fact that a plurality of (three in this example) fins 51 are arranged substantially in parallel with each other along the direction in which the sheet-shaped resin S hangs on the surface facing each of the split molds 21 and 22 is described above. This is the same as the second embodiment.
また、分割された各空間には、シート状樹脂Sが垂下される方向おいて、上方位置にエアーを供給するエアー供給口52が形成され、下方位置にエアーの出口となるエアー排出口53が形成されていることも先の第2の実施形態と同様である。ただし、本実施形態の場合、中間金型23の両面からエアーを供給する必要があることから、中間金型23の上端面中央にエアー供給口52が形成され、そこから分岐する形で各分割金型21,22との対向面に開口部52aが形成されている。同様に、中間金型23の下端面中央にエアー排気口53が形成され、そこから分岐する形で各分割金型21,22との対向面に開口部53aが形成されている。
In each of the divided spaces, an air supply port 52 for supplying air is formed at an upper position in a direction in which the sheet-shaped resin S hangs, and an air discharge port 53 serving as an air outlet is formed at a lower position. It is formed in the same manner as in the second embodiment. However, in the case of the present embodiment, since air needs to be supplied from both sides of the intermediate mold 23, an air supply port 52 is formed at the center of the upper end surface of the intermediate mold 23, and each divided port is branched from the air supply port 52. An opening 52a is formed on a surface facing the molds 21 and 22. Similarly, an air exhaust port 53 is formed at the center of the lower end surface of the intermediate mold 23, and an opening 53a is formed on the surface facing each of the split molds 21 and 22 so as to branch therefrom.
このように中間金型23を閉空間形成用金型とし、各分割金型21,22との対向面にフィン51を形成することで、各シート状樹脂S1,S2の成形において、図12に示すように、エアーが整流された状態でフィン51により分割された細長い空間を下方に向かって流通し、第2の実施形態と同様の効果が得られる。その結果、成形効率の大幅な向上と精度の高い真空成形とを同時に実現することが可能である。
In this manner, by forming the intermediate mold 23 as a mold for forming a closed space and forming the fins 51 on the surfaces facing the divided molds 21 and 22, the molding of the sheet-like resins S1 and S2 is performed as shown in FIG. As shown in the figure, the air flows downward in the elongated space divided by the fins 51 in a state where the air is rectified, and the same effect as in the second embodiment can be obtained. As a result, it is possible to simultaneously achieve significant improvement in molding efficiency and high-precision vacuum molding.
(第4の実施形態)
本実施形態は、閉空間形成用金型や中間金型にフィンを設ける代わりに、シート状樹脂にリブを設け、これをフィンとして利用し効率的な冷却を実現しようとするものである。 (Fourth embodiment)
In the present embodiment, instead of providing the fins in the closed space forming mold or the intermediate mold, ribs are provided on the sheet-like resin, and the ribs are used as the fins to achieve efficient cooling.
本実施形態は、閉空間形成用金型や中間金型にフィンを設ける代わりに、シート状樹脂にリブを設け、これをフィンとして利用し効率的な冷却を実現しようとするものである。 (Fourth embodiment)
In the present embodiment, instead of providing the fins in the closed space forming mold or the intermediate mold, ribs are provided on the sheet-like resin, and the ribs are used as the fins to achieve efficient cooling.
ただし、リブを整流板として利用する場合には、高さの高いリブを形成する必要がある。しかしながら、溶融状態のシート状樹脂を成形して高さの高いリブを形成しようとすると、硬化する前に倒れてしまう等の不都合が発生するおそれがある。
However, when the rib is used as a current plate, it is necessary to form a high rib. However, if a high-profile rib is formed by molding a sheet-like resin in a molten state, there is a possibility that inconveniences such as falling down before curing may occur.
そこで、本実施形態では、例えば図13に示すように、シート状樹脂Sを賦形するための成形用金型201から突き出しピン203を突き出してリブを形成する際に、対向する閉空間形成用金型202にスリット202Aを設けておき、突き出しピン203を突き出すことにより形成されるリブの先端をこのスリット202Aで挟み込んで支持し、突き出しピン203を後退させてもリブが倒れ込まないようにしている。
Therefore, in the present embodiment, as shown in FIG. 13, for example, when a protruding pin 203 is protruded from a molding die 201 for shaping the sheet-shaped resin S to form a rib, the opposing closed space forming A slit 202A is provided in the mold 202, and the tip of a rib formed by projecting the protrusion pin 203 is sandwiched and supported by the slit 202A so that the rib does not fall down even if the protrusion pin 203 is retracted. I have.
図14は変形例であり、本例では、閉空間形成用金型202にインサート部品204を装着しておき、ここに突き出しピン203を突き出すことにより形成されるリブの先端を溶着させて支持するようにしている。インサート部品204は、例えば射出成形品や発泡成形体等である。
FIG. 14 shows a modified example. In this example, an insert part 204 is mounted on a mold 202 for forming a closed space, and the tip of a rib formed by protruding a protruding pin 203 is welded and supported. Like that. The insert component 204 is, for example, an injection molded product, a foam molded product, or the like.
いずれの場合にも高さの高いリブを形成することが可能であり、これらリブをフィンの代わりに整流板として利用することが可能である。閉空間内はリブにより分割され、効率的な冷却が実現される。なお、前記リブで分割される各空間において、閉空間形成用金型202にエアー供給口やエアー排気口を設けることは、先の第2の実施形態や第3の実施形態と同様である。
In each case, high ribs can be formed, and these ribs can be used as rectifying plates instead of fins. The inside of the closed space is divided by the rib, and efficient cooling is realized. The provision of an air supply port and an air exhaust port in the closed space forming mold 202 in each of the spaces divided by the ribs is the same as in the second and third embodiments.
以上、本発明の実施形態について説明してきたが、本発明がこの実施形態に限定されるものではなく、本発明の要旨を逸脱しない範囲で種々の変更が可能であることは言うまでもない。例えば、先の第1の実施形態において、中間金型23を中空の環状金型としたが、これに限らず、中空ではない(いわゆる中実の)金型であってもよい。
Although the embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and it goes without saying that various modifications can be made without departing from the spirit of the present invention. For example, in the first embodiment described above, the intermediate mold 23 is a hollow annular mold, but is not limited to this, and may be a non-hollow (so-called solid) mold.
1,101 押出機
11,111 ホッパー
12,112 シリンダー
13,113 油圧モーター
14,114 アキュムレータ
15,115 油圧シリンダー
16,116 Tダイ
17,117 押出スリット
18,118 ローラー
21、22 分割金型
21A、22A 金型キャビティ
21B、22B 真空吸引孔
23 中間金型
23C、23D 突出部
31,32 型枠
31A,32A 真空吸引孔
41、42 成形品
41a、42a 食い切り部
b バリ
51 フィン
122 成形用金型
140 閉空間形成用金型
141 フィン
142 エアー供給口
143 エアー排出口
201 成形用金型
202 閉空間形成用金型
202A スリット
204 インサート部品
1,101 Extruder 11,111 Hopper 12,112 Cylinder 13,113 Hydraulic motor 14,114 Accumulator 15,115 Hydraulic cylinder 16,116 T die 17,117 Extrusion slit 18,118 Roller 21,22 Split mold 21A, 22A Mold cavities 21B, 22B Vacuum suction holes 23 Intermediate dies 23C, 23D Projections 31, 32 Mold frames 31A, 32A Vacuum suction holes 41, 42 Molded products 41a, 42a Cut-off portions b Burrs 51 Fins 122 Molding mold 140 Closed Space forming mold 141 Fin 142 Air supply port 143 Air discharge port 201 Molding mold 202 Closed space forming mold 202A Slit 204 Insert part
11,111 ホッパー
12,112 シリンダー
13,113 油圧モーター
14,114 アキュムレータ
15,115 油圧シリンダー
16,116 Tダイ
17,117 押出スリット
18,118 ローラー
21、22 分割金型
21A、22A 金型キャビティ
21B、22B 真空吸引孔
23 中間金型
23C、23D 突出部
31,32 型枠
31A,32A 真空吸引孔
41、42 成形品
41a、42a 食い切り部
b バリ
51 フィン
122 成形用金型
140 閉空間形成用金型
141 フィン
142 エアー供給口
143 エアー排出口
201 成形用金型
202 閉空間形成用金型
202A スリット
204 インサート部品
1,101 Extruder 11,111 Hopper 12,112 Cylinder 13,113 Hydraulic motor 14,114 Accumulator 15,115 Hydraulic cylinder 16,116 T die 17,117 Extrusion slit 18,118
Claims (8)
- 押出機より押出された溶融状態の第1のシート状樹脂および第2のシート状樹脂をそのまま下方に垂下させて分割金型間に配置し、
一方の分割金型と第1シート状樹脂の間の空気を減圧することによって第1シート状樹脂を一方の分割金型の金型キャビティに密着させるとともに、他方の分割金型と第2シート状樹脂の間の空気を減圧することによって第2シート状樹脂を他方の分割金型の金型キャビティに密着させ、
各シート状樹脂を密着させた分割金型間に中間金型を介在させ、型締めすることを特徴とする成形方法。 The first sheet-like resin and the second sheet-like resin in a molten state extruded from the extruder are drooped downward as they are and arranged between the split molds,
The first sheet-shaped resin is brought into close contact with the mold cavity of one of the divided molds by reducing the pressure of the air between one divided mold and the first sheet-shaped resin, and the other divided mold and the second sheet-shaped resin. By depressurizing the air between the resins, the second sheet-shaped resin is brought into close contact with the mold cavity of the other split mold,
A molding method characterized in that an intermediate mold is interposed between divided molds in which respective sheet-shaped resins are adhered, and the molds are clamped. - 前記中間金型は、前記各分割金型の金型キャビティの外周縁の外側に沿って突き当てられる突出部を有することを特徴とする請求項1記載の成形方法。 The molding method according to claim 1, wherein the intermediate mold has a protruding portion that is abutted along an outer peripheral edge of a mold cavity of each of the divided molds.
- 前記中間金型の形状が環状であることを特徴とする請求項1または2記載の成形方法。 3. The molding method according to claim 1, wherein the shape of the intermediate mold is annular.
- 各分割金型の外周部に形成した型枠を前記中間金型との突き当て面よりも突出した状態で各シート状樹脂に当接させて密閉空間を形成して、各分割金型とシート状樹脂の間の空気を減圧することを特徴とする請求項1から3のいずれか1項記載の成形方法。 The mold formed on the outer peripheral portion of each split mold is brought into contact with each sheet-like resin in a state protruding from the abutting surface with the intermediate mold to form a sealed space, and each split mold and sheet The molding method according to any one of claims 1 to 3, wherein the pressure between the resin particles is reduced.
- 押出機より押出された溶融状態のシート状樹脂を下方に垂下させて成形用金型と閉空間形成用金型の間に配置し、成形用金型とシート状樹脂の間の空気を減圧することによってシート状樹脂を成形用金型の金型キャビティに密着させるに際し、
閉空間形成用金型の成形用金型との対向面に複数のフィンを略並列に配列形成し、これらフィンにより分割された各領域において、当該閉空間形成用金型側からエアーによる冷却を行うことを特徴とする成形方法。 The molten sheet-like resin extruded from the extruder is hung downward, placed between the molding die and the closed space forming die, and the air between the molding die and the sheet-like resin is reduced in pressure. When the sheet-like resin is brought into close contact with the mold cavity of the molding die,
A plurality of fins are arranged substantially in parallel on the surface of the closed space forming mold facing the molding die, and in each area divided by these fins, cooling by air is performed from the closed space forming mold side. A molding method characterized by performing. - 前記フィンにより分割された各領域において、閉空間形成用金型の一端側にエアーの吹き出し口を設け、多端側にエアーの排気口を設けることを特徴とする請求項5記載の成形方法。 6. The molding method according to claim 5, wherein in each area divided by the fin, an air outlet is provided at one end of the mold for forming a closed space, and an air outlet is provided at multiple ends.
- 押出機より押出された溶融状態の第1のシート状樹脂および第2のシート状樹脂をそのまま下方に垂下させて分割金型間に配置し、
一方の分割金型と第1シート状樹脂の間の空気を減圧することによって第1シート状樹脂を一方の分割金型の金型キャビティに密着させるとともに、他方の分割金型と第2シート状樹脂の間の空気を減圧することによって第2シート状樹脂を他方の分割金型の金型キャビティに密着させ、
各シート状樹脂を密着させた分割金型間に各分割金型との対向面に複数のフィンを略並列に配列形成した中間金型を介在させ、型締めした後、中間金型側からエアーによる冷却を行うことを特徴とする成形方法。 The first sheet-like resin and the second sheet-like resin in a molten state extruded from the extruder are drooped downward as they are and arranged between the split molds,
The first sheet-shaped resin is brought into close contact with the mold cavity of one of the divided molds by reducing the pressure of the air between one divided mold and the first sheet-shaped resin, and the other divided mold and the second sheet-shaped resin. By depressurizing the air between the resins, the second sheet-shaped resin is brought into close contact with the mold cavity of the other split mold,
An intermediate mold in which a plurality of fins are formed in a substantially parallel arrangement on the surface facing each divided mold is interposed between the divided molds in which each sheet-shaped resin is adhered, and after clamping, the air is blown from the intermediate mold side. A molding method characterized by performing cooling by a method. - 前記フィンにより分割された各領域において、中間金型の一端側にエアーの吹き出し口を設け、多端側にエアーの排気口を設けることを特徴とする請求項7記載の成形方法。
8. The molding method according to claim 7, wherein in each of the areas divided by the fin, an air outlet is provided at one end of the intermediate mold and an air outlet is provided at multiple ends.
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JP2006068930A (en) * | 2004-08-31 | 2006-03-16 | Kyoraku Co Ltd | Manufacturing method of composite molded product |
JP2011073422A (en) * | 2009-09-30 | 2011-04-14 | Kyoraku Co Ltd | Molding method |
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JPS5388573U (en) * | 1976-12-21 | 1978-07-20 | ||
JP2006068930A (en) * | 2004-08-31 | 2006-03-16 | Kyoraku Co Ltd | Manufacturing method of composite molded product |
JP2011073422A (en) * | 2009-09-30 | 2011-04-14 | Kyoraku Co Ltd | Molding method |
JP2013049196A (en) * | 2011-08-31 | 2013-03-14 | Kyoraku Co Ltd | Molding method and molding device using core |
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